Perhaps it would be possible to restrict use of the app to one account per IMEI. If or when the device is later sold or given away to someone else, the new device-owner would be required to submit several face pics which meet specific requirements (e.g. “outside a library”, “winking with tongue out”) before the IMEI is permitted. Or would it be easier to clear the IMEI for use by enforcing a 1:1 relationship with IMEIs at the account level, i.e. a user can not log in on a new device without jettisoning the previous IMEI link?
Perhaps it would be possible to restrict use of the app to one account per IMEI. If or when the device is later sold or given away to someone else, the new device-owner would be required to submit several face pics which meet specific requirements (e.g. “outside a library”, “winking with tongue out”) before the IMEI is permitted. Or would it be easier to clear the IMEI for use by enforcing a 1:1 relationship with IMEIs at the account level, i.e. a user can not log in on a new device without jettisoning the previous IMEI link?